We all think ________ our duty ________ tidy the lab after the experiment.

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• 1Experts ________ for Yetis in the Himalayas for years, but they still ________ one．

  A.have looked; haven't been finding

  B.have looked; haven't been found

  C.are looking; haven't been found

  D.have been looking; haven't found

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• 2There we found little snow, as most of ________ seemed to have been blown off the mountain.

  A.that

  B.it

  C.which

  D.what

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• 3Celia ________ for two hours and feels really tired．So she wants to rest for a while．

  A.has been skating

  B.skates

  C.skated

  D.skating

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• 4It ________ this afternoon．

  A.will snow

  B.going to snow

  C.is going to snow

  D.snows

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• 5________ is possible that he will come this afternoon.

  A.What

  B.That

  C.Which

  D.It

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• 6Mother, where ________ you put my cell-phone after you used it?I ________ it anywhere．

  A.have;haven't found

  B.did;didn't find

  C.did;haven't found

  D.have;didn't find

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• 7It was very kind ________ to invite us to go for a picnic on Sunday.

  A.to them

  B.for them

  C.of them

  D.of their

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• 8This the second time that I ________ here．The first time I ________ here, it was in 2002．

  A.have been; have been

  B.am; have been

  C.have been; was

  D.am; was

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• 9________ she was making fun of me.

  A.He seemed as if

  B.He seemed like

  C.It seemed like

  D.It seemed as if

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• 10Peter ________ his homework when Rose went to get her book she ________ in his room．

  A.did; had left

  B.was doing; had left

  C.had done; left

  D.had done; was leaving

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